As Graeme_r quite rightly states, the recordings will consist of personal data belonging to those captured on the images and as such, this information must be held and processed in accordance with council's Data Protection Policy and/or Privacy Policy, which should have been in place prior to capturing any images since the council are a data controller.
The council must understand that the images essentially belong to the data subjects and not the council. Ideally, the council should have undertaken a data subject consultation process or alternatively a DPIA before capturing any images.